Thelander U, Fagerlund M, Friberg S, Larsson S
Department of Orthopedics, University Hospital, Umeå, Sweden.
Spine (Phila Pa 1976). 1994 Sep 1;19(17):1979-84. doi: 10.1097/00007632-199409000-00020.
The study compared different methods to measure the absolute and relative size of lumbar disc herniations on computed tomography scans and their relation to sciatica.
Computed tomography (CT) examinations were done before and at 3 and 24 months after nonoperative treatment in 30 patients with lumbar disc herniations. The size of the herniation was described by different indexes and related to the degree of sciatica. One index was formed by the area of the herniation in relation to the spinal canal (A-index), whereas two indexes were formed by linear measurements of the herniation in relation to the spinal canal in either two (ST-index) or one direction (S-index).
Each index was correlated significantly to the degree of sciatica. The area of the herniations decreased markedly over time.
Linear measurements of the herniation in two perpendicular directions provide a practical and accurate way of describing the size of lumbar disc herniations.
本研究比较了在计算机断层扫描（CT）上测量腰椎间盘突出症绝对和相对大小的不同方法及其与坐骨神经痛的关系。
对30例腰椎间盘突出症患者在非手术治疗前、治疗后3个月和24个月进行计算机断层扫描（CT）检查。用不同指标描述突出物大小，并与坐骨神经痛程度相关联。一个指标由突出物面积与椎管面积之比（A指数）构成，而另外两个指标由突出物在两个方向（ST指数）或一个方向（S指数）上与椎管的线性测量值构成。
每个指标均与坐骨神经痛程度显著相关。随着时间推移，突出物面积明显减小。
在两个垂直方向上对突出物进行线性测量，为描述腰椎间盘突出症大小提供了一种实用且准确的方法。
